THREE STAGE POWER SOURCE FOR ELECTRIC ARC WELDING
First Claim
1. A power source for welding;
- comprising;
a first stage to receive a first signal and output a second signal having a first DC voltage;
a second stage to receive said second signal and output an isolated third signal having a second DC voltage; and
a third stage to receive said third signal and output a welding signal;
wherein said second stage is unregulated inverter stage having a duty cycle of at least 80%.
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Accused Products
Abstract
A three stage power source for an electric arc welding process comprising an input stage having an AC input and a first DC output signal; a second stage in the form of an unregulated DC to DC converter having an input connected to the first DC output signal, a network of switches switched at a high frequency with a given duty cycle to convert the input into a first internal AC signal, an isolation transformer with a primary winding driven by the first internal high frequency AC signal and a secondary winding for creating a second internal high frequency AC signal and a rectifier to convert the second internal AC signal into a second DC output signal of the second stage, with a magnitude related to the duty cycle of the switches; and, a third stage to convert the second DC output signal to a welding output for welding wherein the input stage has a regulated DC to DC converter with a boost power switch having an active soft switching circuit.
156 Citations
65 Claims
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1. A power source for welding;
- comprising;
a first stage to receive a first signal and output a second signal having a first DC voltage;
a second stage to receive said second signal and output an isolated third signal having a second DC voltage; and
a third stage to receive said third signal and output a welding signal;
wherein said second stage is unregulated inverter stage having a duty cycle of at least 80%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
- comprising;
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18. A power source for welding;
- comprising;
a first stage to receive a first signal and output a second signal having a first DC voltage;
a second stage to receive said second signal and output an isolated third signal having a second DC voltage, said second stage having a single transformer; and
a third stage to receive said third signal and output a welding signal;
wherein said single transformer is the only transformer within said power source. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
- comprising;
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34. A power source for welding;
- comprising;
a first stage to receive a first signal and output a second signal having a first DC voltage;
a second stage to receive said second signal and output an isolated third signal having a second DC voltage; and
a third stage to receive said third signal and output a welding signal;
wherein said power source produces a peak power and an average power and has a peak to average power ratio of at least 4. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
- comprising;
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51. A power source for welding;
- comprising;
a first stage to receive a first signal and output a second signal having a first DC voltage;
a second stage to receive said second signal and output an isolated third signal having a second DC voltage, said second stage having a soft switching circuit; and
a third stage to receive said third signal and output a welding signal;
wherein said soft switching circuit does not use phase shifting for soft switching. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65)
- comprising;
Specification